start = zoo
block = p | info | danger | attention
inline = b | i | em | strong | stabilo | img
attractions = aquarium?, vivarium?, enclos?, volière?
animal = (animal-attr), nom, sexe, taille, poids, commentaire?
animal-attr =
    attribute id { xsd:ID },
    attribute espèce { text }?,
    attribute nom-savant { text }?,
    attribute photo { xsd:anyURI }?,
    attribute date-naissance { xsd:date }
p = element p { (text | inline)* }
info = element info { (text | inline)* }
danger = element danger { (text | inline)* }
attention = element attention { (text | inline)* }
b = element b { (text | inline)* }
i = element i { (text | inline)* }
em = element em { (text | inline)* }
strong = element strong { (text | inline)* }
stabilo = element stabilo { (text | inline)* }
img =
    element img {
        attribute src { xsd:anyURI },
        empty
    }
zoo = element zoo { block*, attractions }
aquarium = element aquarium { mammifères-marins?, poissons? }
mammifères-marins =
    element mammifères-marins { dauphins?, baleines?, orques? }
poissons = element poissons { sélaciens? }
vivarium = element vivarium { serpents?, arachnéens? }
serpents = element serpents { boas? }
arachnéens = element arachnéens { mygales? }
enclos = element enclos { primates?, fauves? }
primates = element primates { gorilles?, orangs-outans? }
fauves = element fauves { tigres?, lions? }
volière =
    element volière {
        oiseaux-terrestres?, oiseaux-aquatiques?, rapaces?
    }
oiseaux-terrestres = element oiseaux-terrestres { autruches? }
oiseaux-aquatiques = element oiseaux-aquatiques { pingoins?, manchots? }
rapaces = element rapaces { aigles? }
dauphins = element dauphins { (block | dauphin)+ }
dauphin = element dauphin { animal }
baleines = element baleines { (block | baleine)+ }
baleine = element baleine { animal }
orques = element orques { (block | orque)+ }
orque = element orque { animal }
sélaciens = element sélaciens { (block | requin)+ }
requin = element requin { animal }
boas = element boas { (block | boa)+ }
boa = element boa { animal }
mygales = element mygales { (block | mygale)+ }
mygale = element mygale { animal }
gorilles = element gorilles { (block | gorille)+ }
gorille = element gorille { animal }
orangs-outans = element orangs-outans { (block | orang-outan)+ }
orang-outan = element orang-outan { animal }
tigres = element tigres { (block | tigre)+ }
tigre = element tigre { animal }
lions = element lions { (block | lion)+ }
lion = element lion { animal }
autruches = element autruches { (block | autruche)+ }
autruche = element autruche { animal }
pingoins = element pingoins { (block | pingoin)+ }
pingoin = element pingoin { animal }
manchots = element manchots { (block | manchot)+ }
manchot = element manchot { animal }
aigles = element aigles { (block | aigle)+ }
aigle = element aigle { animal }
nom = element nom { text }
sexe = element sexe { "M" | "F" | "?" }
taille =
    element taille {
        attribute unité { "μm" | "mm" | "cm" | "dm" | "m" | "dam" },
        attribute status { text }?,
        xsd:float { minInclusive = "0" }
    }
poids =
    element poids {
        attribute unité {
            "μg" | "mg" | "cg" | "dg" | "g" | "dag" | "hg" | "kg" | "t"
        },
        attribute status { text }?,
        xsd:float { minInclusive = "0" }
    }
commentaire =
    element commentaire { commentaire-attlist, (text | block)* }
commentaire-attlist &= empty